A majestic space marine standing under the harsh midday sun, clad in intricate biomechanical armor reminiscent of H.R. Giger's designs. The marine's pose is powerful, capturing the essence of a warrior ready for battle. His face, partially shadowed by the helmet, exudes calm determination. The landscape around him is stark and otherworldly, filled with surreal structures and alien textures. This scene is rendered as a masterful oil painting, with rich, dark tones and dramatic lighting akin to Rembrandt's style, emphasizing the texture of the armor and the play of light and shadow across the marine's figure. Subtle cosmic elements, like distant planets or stars, peek through the sky, adding an ethereal quality to the composition.